Projectile for ordnance.



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PROJECTlLEFR QRNANCE.

SPGEFIQATION forming part of Letters EatentNo. 649,339, dated May 8, 1900.

Application and February 5,1900. stanno. 4,031.- maman.;

'To all whom it rnay concern: ,l

.Be it known that l, Hman STEVENS MAXIM,

.Chevalier ofthe Legion of Honon'civil and mechanical engineer, a subject of the Queen of Great Britain, residing at 18 Queens Gate Placailcndcn, England, have invented certain new and useful lmprovementsin Projectiles for Ordnance, of which the following is a specification.

This' invention Yhas reference to projectiles of the hind in which 'a dexible metallic cap or-disk having a peripheral rim or iange is provided at the base of the projectile forcempressingan obturatingringor gascheck when the pressure of the powder-gases acts upon the said iexible metallic cap, disk, or basepiece. l lt has hitherto been usual to obtain .the aforesaid peripheral angeby dishing or bending the basepiece near its edge; but in' such cases there has been a liability of the base-pieceavhen subjected tothe gas-pressure tobecotne tzjactured at' the part adjacent to the bend, with the result that the pressure of the powder-gases has not been transmitted tothe gas-check in an efficient manner. It

isthe object of my invention to'overcotne this liability by forming the aforesaid ilexible base-piece and its peripheral flange in'two parts instead of in one piece, as heretofore,

the said ange being made in' the form of a stout ring and subsequently connected to the base-piece in any appropriate manner.

In order Ythat my saidinvention may be clearly understood and' readily carried into eect, l will now. proceed to describe the same more fully with reference to the 'accompanying drawings, in which--v Figures l and 2 are longitudinal sections of the rear portion of a projectile provided withmy improved base-piece, Fig. l repre- Santing the parts approximately in the positionthey occupy prior to the ring of the gun and Fig. 2 representing' the said parts approximately in the position they occupy after tiring and when the flexible base-piece has been acted upon by the pressure of the powder-gases.

A is the projectile; B, the fiexible basepiece; C, the ring-flange thereof; D, the screw for securing the base-piece to the projectile 5` as and for the purpose specified.

E, the gas-check; F, the driving-band, and G thegun-barrel. The .said ange C comprises, as already stated, a stout ring'made,

preferably, of mild steel, which is adapted to them to remain permanently fixed together'.`

The outer face of the ring C is curved at the part c' to more or less conform to the curved shape of the portion of the basepiece adjacent thereto, so thatl when said base-piece is bent or deformedby the pressure of the powdergases it -will not meet any sharp cornerl on the said ring that would tend to fracture it. The said outer lface of the ring C is also preferably enlarged, so that its surface is of greater area than that of the inner end. lThe base of the projectile is also recessed at a for the said enlarged portion of the ring` to enter, so that the forward movement of said ring will-not be impeded when the pressure of the powdergases acts upon it and the basepiece. The gas-check E is composed of a semiplastic or compressible substance,` as is Well understood, and is situated between the inner end of the said ring C and the aforesaid shoulder a on the base of theprojectile, so as to be compressed by the movement of said ring C.

What I claim, and desire to secure by Letters Patent of the United States, is-.

l. In a projectile, the combination with an obturating-ring, of a base-piece constructed of two parts, having its periphery made in the vform of a separate ring suitably connected therewith substantially as and for the purpose spe-sided. Y n

2. In a projectile, the combination withan obturating-ring, cfa base-piece consisting of two portions one in the form of a iexible metallic disk and the other in the form of a rigid metallic ring connected with the periphery of said flexible metallic disk substantially Ibo 3. n a projectile, the combination with an my hand, in presence of twe sbseribing Witobturating-rng, of a, base-piece having: its messes, rhis 9th day Vof J anna/ry, 1900. periphery made in the form of a ring 0011-' V T *y Y, rneeted therewith, said rin'g having a curved A HIRAM STB ENS MAXIM' 5' pertion adjacent to. the base-peee subsmnl 1Witnesses:

gt'tally as and fet' the prpose specified. J. COLLINS, In testimony whereof l have hereunto set- TALTER J. SKERTEN. 

